Scoping out limits
Running multiple applications on the ServiceNow platform brings benefits of scale. You may have IT using it to organize production issues, HR may perform case management, while the maintenance team use it to track leaky taps-each using separate, specialist applications that are built for their use. Since you are using a single platform, it makes it possible to share some data.
The Users table is a great example of this. While each department will want to control the privileges that each person has (someone from the facilities team probably shouldn't have access to all the payroll data), sharing the core data means there is one place to go and update. If you change your name, isn't it nice to do it on one system, without relying on complex integrations to simulate a cohesive system?
The diagram below represents how many applications all need to reply upon shared resources, like the user table.
Also, you often want applications to talk to each other. Consider that...
